Bolt-anchor.



W.v PLEISTER.

son ANCHOR.l l APPLICATION FMD MAR. 17. 1916.

1,222,988. v Patented Apr. 17, 1917.

*. ff 12 y mi' @Mm ATTORNEY HENRY W. PLEISTER, OF WESTFIELD, NEW JERSEY,.ASSIGNOR T HENRY 1B. NEWHALII.

BOLT-ANCHOR. i'

Specication of Letters Patent.

Patented Apait, 1917.

Original application iled October 16, 1915, Serial No. 56,239. Dividedand this application led March 17,

1916. Serial N o. 84,896.

To all whom t may concern:

Be it known that I, HENRY W. PLEISTER, a citizen of the United States,and a resident of Vesteld, in the county of Union and State of NewJersey, have invented cerf I have shown 1n Ithe'acconnpanying drawtainnew and useful-Improvements in Bolt- Anchors, of which the following isa speciiication taken in connection with the accompanying drawings,which form a part of the same.

This application is a division vof my copendingapplication Ser. N o.56,239 led October 16, 1915, for bolt anchorsy and method of makingsame.

My present invention relates to a newand improved boltanchor in whichthe `screwthreads of the screw. cut their own coperating femalescrewthreads in the bolt anchor. In this form my bolt anchor is made outof a comparatively soft metal suchas a lead alloy or similar material,which is s ofter than the metal of the wood screw, or lagvbolt, shouldthe latter be used. In this art relatively soft bolt anchors, in whichthe wood screw cuts its own coperating female screwthreads, are knownas` anchors, lead anchors and Screw anchors. l

More specifically my invention relates to such an anchor, lead anchororl screwy an.

chor, which can be manufactured `at the minimum expense due to thesaving of material. v Y

My invention further relates to a relatively soft rod or bar having aplurality of units, the Vunits having open sides, whereby one or moreunits may be broken on' to form an anchor, lead anchor or screw anchorof the required holding capacity. Y

ings several illustrative embodiments of my invention, but of course itis to'be understood that my invention is notto be conned simplytotheforms illustrated. In these drawings the same reference numerals referto similar parts. I Y I lFigure l is aside elevation, partly in verticalsection of one of my improved anchors; v

F ig. 2 is a view partly in side elevation andV partly infverticalsection of lone of my anchor rods or bars which vmay be used as oneanchor, or which may be broken into one or more units, if an anchor ofless'holding capacity is required; v

Fig. 3 is a verticalv section of oneductile unit broken from the rod orbar illustrated in Fig. 2;

Fig-t is a side elevation of the preferred form of my anchor, formed oftwo units, and shown mounted in a hole or support and prior to beingexpanded, the support being shownfin section;

Fig. 5 is a Vertical section through my improved anchor after it hasbeen expanded by the screw shown, or any kother suitable means, thesupport and the article supported being shown in section; l

Fig. 6 is an end elevation substantially on the line 6-6 of Fig. 4,looking in the direction of the arrows, showing the units formo ing 'asubstantially.cylindrical anchor and 2 and 3, the unit 2 havinganlopeniside 4 and the unit 8 having an open side 5, the open sides beingatan angle to each other and preferablyformed staggered. Between each unitand its adjacent unit there is a connecting member formed of'two. arms6,6. l

The open side 4c is provided with an inclined surface 7, and the openside 5 is provided with an inclined surface 8, the two inclined surfacesbeing atan angle to each other. These two' inclined surfaces 7 and '8form an inclined bore 9 which is interrupted or broken opposite theopenjsides 4 and `5v of the units.

I preferably, though not necessarily, form the units 2 and 3, so that intheir unexpanded position theywill substantially form a cylinder which,'ofcourse, would not be continuous throughout fthe length of the boltanchor due to the units 2 and 3 having open sides. Y f I In locating myanchor in a wall or other support l0 the hole l1 is drilled or otherwiseformed substantially atV right angles to theA face l2 of the support,the hole being about the same depth as the length of the anchor. Thelength of the latter is determined by the ico Y the wood screw 14, ispassed through the work13 and into engagement with the respectiveinclined surfaces 7 and 8 of the units 2 and 3. The wood screw will asitis screwed home, cut its own cooperating female screwthreads in thecomparatively soft or ductile material of the inclined surfaces 7 and 8,and will cause a tremendous expansion, which in the unit 1 forexample,will begin some little distance back from the outer end 17 and reach itsmaximum, in that unit, at the point 18. On the other unit 3 theexpansion -will progress from the point 19 and reach its maximum at the.point 20. Thisaction will insure a powerful gripping action between theanchor and the support, whether that' Vsupport be brick, masonry,concrete, tile,

stone or any othermaterial.

I preferably, though not necessarily, provide the bolt anchor 1 with oneor more lugs 21, which may be bent sufficiently to form a support forthe wood screw 14, or other expanding member. These lugs may also holdthe wood screw kto the anchor for purposes of shipping or storing. Y

In the expanding action which I have just described, the connectingmember formed of arms 6, 6 will ofcourse bend slightly to permit of theexpansion. I alsopreferably provide theV exterior of my units withtransverse ribs or corrugations 28, 23 to insure that they have strongerfrictional hold against the wall of the hole 11 inthe support 10.

It will be clear that with my bolt anchor I obtain a tremendousexpansion or holding capacity using only aminimum amountof ductile orrelatively soft metal, the saving of which permits me to manufacture myanchor` at minimum expense.

The method of manufacturing my anchor is described inY full in mycopending vapplicationsSer. No. 56,239 and Ser. No. 84,895, filedconcurrently with this divisional application. Y Inl this applicationSer. No. 84,895 the method kis claimed.V

By my invention I may cast a ductile rod or bar 24, Fig. 2, of aplurality of units 25 and 26 which may be of any suitable length. Forconvenience in handling and shipping these ductile bars or rods 24 maybeshipped direct to the jobber or retailer or user who may use the entirebar as one anchor or may break olf one or more of the ductile units toobtain a smaller anchor and one ofthe par; ticular holding capacity thathe may need for the particular work to Vbe supported. He may forexample, break od one unit, Fig. 3, or he may break ofi1 two or moreunits, simply by severing the connecting member 6, 6 between any twounits.

It will be seen when my anchor comprises two or -more units, that theirexpansion is in opposite directions about a point intermediate thelengthof-the. anchor. It will also be seen that my anchor has aplurality of points ofmaximum expansion arranged in different planes.

Having thus described this invention in connection with the illustrativeembodiments thereof to the details of which I do not de sire to belimited what is claimed as new and what. it is desired to secure byLetters Patent is set forth in the appended claims.

1. An article of manufacture comprising an expansible ductile anchor'having a plurality of open sides. Y

2. An article of manufacture comprising an expansible ductile-anchorhaving a plurality of open sides arranged staggered with relation toeachl other.

3. Anarticle of manufacture comprising anexpansible ductile anchorhaving a plurality of open sides and a central axial bore.

4. An article of manufactureV comprising an expansible ductile anchorhaving a plurality of open sides, said sides having inclined surfacesatanangle to leach other.

5. An article l.of manufacture comprising an expansible ductile anchorhaving a plurality of open sides arranged on different portions of theanchor.

6. AnV article of manufacture comprising an expansible ductile anchorformed of a plurality of units, each unit having an open side and aconnecting bendable member between the units.

7. An article of manufacture comprising an expansible ductile anchor:formed of a plurality of units, eachunit having an open side and ayconnecting bendable and breakable member between the units.

8. An articlecf manufacture comprising a substantially cylindricalrductile anchor formed of a plurality of units, each unit having an openside, anda connecting bendable member between the units, said anchorbeing provided with an internal bore having a plurality of tapers.

9. An'article of Vmanufacture comprising an expansible Yductile anchorhaving a plurality of open sides and an internal bore having` aplurality ofvtapers.

10. An article'of'manufacture comprising an-expansible ductile anchorrod formed of a plurality of units, each unit having lan open side andbendable and breakable connecting members connecting the units to permitthe rod to be used as one anchor, or

to permit an anchor of any required length and of one or more unitsbeing broken off from the rod to form a smaller anchor, said rod beingprovided With an internal bore 5 having a plurality of tapers.

10 one of the open sides.

12. An article of manufacture comprising a substantially cylindricalductile anchor formed of a plurality of units,l each unit having an openside, and a connecting bendable member between the units and one or morebendable lugs adapted to be bent to partly close one of the open sides.

HENRY W. PLEISTER.

Gopies of this patent may be obtained for ve cents each, by addressingthe Commissioner of Patent,

. Washington, D. C.

